RECON: TNO occultation with 530941

Event between (530941) 11XJ4 and star GA0820:04193587 with event index number of 1599957

Geocentric closest approach at 2021/07/10 00:23:50 UTC

J2000 position of star is 12:09:30.1 -07:24:33
Equinox of date position of star is 12:10:35.9 -07:31:40
Stellar brightness G=15.3, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 78 degrees from the moon. Moon is 0% illuminated.
TNO apparent brightness V=22.9

TNO is 37.3 AU from the Sun and 37.5 AU from the Earth.
The TNO is moving 11.8 km/sec on the sky relative to the star, or, 1.6 arcsec/hr.
The 1-sigma error in the time of the event is 287 seconds.
The 1-sigma cross-track error in the shadow position is 2969 km.

The TNO has an absolute magnitude Hv=7.0
Diameter=239.9 km assuming a 5% albedo -- 20.3 sec chord
Diameter=97.9 km assuming a 30% albedo -- 8.3 sec chord
Dynamical classification is SCATEXTD
 
 
 
 
 
 
 
 

Star training set for 530941, (2021/07/10 00:24UT)
Object            RA         Dec     mag  sep  mel
Spica          13:26:19.8 -11:16:23  1.0 19.04  96
4Gam Crv       12:16:55.0 -17:39:41  2.6 10.25  84
PPM 195089     12:03:57.8 -07:48:12  5.8  1.67  77
PPM 195219     12:11:33.5 -07:53:37  6.8  0.43  78
PPM 195193     12:10:09.1 -07:42:02  9.6  0.21  78
530941         12:10:36.4 -07:31:44 15.3        78
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 530941, (2021/07/10 00:24UT)
Object            RA         Dec     mag  sep  mel
Spica          13:25:11.5 -11:09:41  1.0 19.04  96
4Gam Crv       12:15:48.1 -17:32:30  2.6 10.25  84
PPM 195089     12:02:51.6 -07:41:01  5.8  1.67  77
PPM 195219     12:10:27.2 -07:46:26  6.8  0.43  78
PPM 195193     12:09:02.8 -07:34:51  9.6  0.21  78
530941         12:09:30.1 -07:24:33 15.3        78
Positions are for J2000

Event circumstances last updated at 2021/05/02 22:56:42 UT

Marc W. Buie, Southwest Research Institute

RECON